Clothes Dryer Heat Exchanger Pressure Differential Switch

!±8± Clothes Dryer Heat Exchanger Pressure Differential Switch

This is another addition to the Clothes Dryer Heat Exchanger project. I was looking for a way to start and stop the fan automatically when the dryer started and stopped. I was going to tap into the timer on the dryer and hook up a relay, but decided I didn't want to run wires out of the dryer. I though I would try a pressure differential switch. It works by using a diaphram and two ports. An increase in air pressure unbalances the diaphram on one side and activates a switch. I hooked the high pressure side of the diaphram to the air outlet of the dryer and left the low pressure side vented to atmosphere. When the dryer is started the higher pressure of the air coming from the dryer outlet moves the diaphram and activates a switch. When the dryer shut off the air pressure drops and the diaphram returns to its normal position. It works great. I got the pressure differential switch off E-bay pretty cheap.

Clothes Dryer Heat Exchanger Pressure Differential Switch

Wholesale Hoover Steamvac Deep Cleaner Save Mexican Fender Stratocaster